This study was designed to explore CDZ173, a selective PI3Kδ inhibitor, in patients with genetically activated PI3Kδ, i.e., patients with Activated phosphoinositide 3-kinase delta syndrome/ p110δ-activating mutation causing senescent T cells, lymphadenopathy and immunodeficiency (APDS/PASLI). The study consisted of two parts: Part I was the open label part designed to establish the safety and pharmacokinetics of CDZ173 in the target population, as well as to select the optimal dose to be tested in Part II. Part II was designed to assess efficacy and safety of CDZ173 in the target population.
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Part I: Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
Timeframe: From the start of treatment to 30 days after end of treatment, assessed up to maximum duration of 114 days
Part I: CDZ173 Dose Concentration
Timeframe: Days 1, 29 and 57 (0.25 and 3 h post morning dose) and Day 84
Part I: Percentage of Inhibition of Unstimulated and Stimulated pAkt Levels in B Cells
Timeframe: Baseline, days 29 and 57 (3 and 12 h post-dose) and day 84
Part II: Change From Baseline in the log10 Transformed Sum of Product of Diameters (SPD) in the Index Lesions
Timeframe: Baseline and Day 85
Part II: Change From Baseline in Percentage of naïve B Cells Out of Total B Cells
Timeframe: Baseline and Day 85